I went away for a week and my mum looked after my goldfish and she over feed the tank and it got quite messy. When I got back I did a 50% water change, usually I only do 20 - 25% each week. Once the water had settled and the tank was clear I saw that one of the two goldfish had white spots on his fins. I therefore went and got some treatment and treated the water. Both of my fancy goldfish were acting odd they would not come to the top for food (but only one had white spots), however after 6 days and two doses of treatment the fish seem like there normal selves again. However I have come home from work today and the one with white spots since this morning has developed dark patches on his back fin and gills. Is this part of the healing process or is there something else wrong with him?

Thanks Becky

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Re: Goldfish Concerns

« Reply #1 on: June 09, 2009, 01:27:29 PM »

hi, becky

Have you checked your water parameters recently. The dark patches could be an indication of a water toxicity problem. I would check the pH, ammonia, nitrate, and nitrate levels to see if they are in the normal range.

Since the fish were overfed, there could be a lot food wastes left in the water and tank that is causing an ammonia spike.Ammonia is always constantly being release into the aquarium water and is a major cause of fish death. A high ammonia level is usually the cause the dark patches, which are dying tissues resulting from the toxic water.

I would do another major water change again and continue with 10% water change after that for the next few days. Keep testing the water until all the parameters are normal again.